Nippon ant killer is effective against most ants. It works because the ants carry the poison back to the nest and it kills the queen ant, who is producing all the eggs. You just put a few drops where the ants are running and the ants do ther rest. Other methods kill ants but don't necessarily kill the source of a lot more ants.
Lacquer spray ant killer is effective in forming a barrier to them, which may be the first requirement, but they'll keep coming wherever they can get in. Nippon takes a little time to kill the queen.